To assess the contribution of Nfib and Foxp1 to tumour growth and metastatic progression, we produced knockout (KO) cells for the two genes using CRISPR‐Cas 9 technology in the highly metastatic LM1 and LM9 lines and generated oligoclonal pools of cells (Appendix Fig S1A and B). Here, FOXP1 is linked to neoplasm.